Fonda, now 85, said French director René Clément asked her the question during the making of 1964’s thriller Joy House, in which she starred.
Clément, who was 51 at the time, died aged 82 in 1996.
‘He wanted to go to bed with me because he said the character had to have an orgasm in the movie and he needed to see what my orgasms were like.
‘He said it in French and I pretended I didn’t understand,’ Fonda explained.
Fonda made the reveal during an appearance on Andy Cohen’s show Watch What Happens Live when the host asked her to name ‘one man in Hollywood that tried to pick you up once that you turned down’.
The Grace and Frankie star appeared on The Drew Barrymore Show in March and reflected on her experience shooting the beloved movie.
She explained: ‘Well, ok. The thing that comes to mind right away is, we have a slapping scene. I slap her, she slaps me, I slap her.’
‘Well, Jennifer – as per Jennifer – she had this enormous diamond ring.
‘And so, when she slapped me one of the times, it cut open across my eye, my eyebrow. You know, she’s never apologised.’
Barrymore, 48, looked shocked by the revelation and gasped as Jane, who recently revealed she was in remission after being diagnosed with cancer, recounted the incident.
Lopez has previously spoken about the slapping scene on her YouTube channel in a video titled, I react to Monster-in-Law.
The Love Don’t Cost a Thing singer explained: ‘She really, really went for it and so did I. And then I punched her in the eye by mistake. Ouch.
‘We talked about how we were going to do this over and over again and I was so afraid to hit Jane Fonda in the face and hurt her in any way.’